77694421 has 16 divisors (see below), whose sum is σ = 91238400. Its totient is φ = 64775088.

The previous prime is 77694389. The next prime is 77694427. The reversal of 77694421 is 12449677.

It is not a de Polignac number, because 77694421 - 2⁵ = 77694389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77694427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107700 + ... + 108418.

It is an arithmetic number, because the mean of its divisors is an integer number (5702400).

Almost surely, 2^77694421 is an apocalyptic number.

It is an amenable number.

77694421 is a deficient number, since it is larger than the sum of its proper divisors (13543979).

77694421 is a wasteful number, since it uses less digits than its factorization.

77694421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128.

The product of its digits is 84672, while the sum is 40.

The square root of 77694421 is about 8814.4438848971. The cubic root of 77694421 is about 426.7071743632.

The spelling of 77694421 in words is "seventy-seven million, six hundred ninety-four thousand, four hundred twenty-one".